If you are creating a movie that explains something, it is very common to use B-roll to provide close-ups of the thing you are explaining.
如果生成的电影要解释某个东西，则经常用B卷对要解释的东西提供特写。
There are various kinds of music: classical, jazz, rock 'n' roll, pop, hip-pop, and R&B, just to name a few.
音乐的类型各式各样，古典、爵士、摇滚、流行、嘻哈和节奏蓝调只是其中一些。
B: Cut the large piece of dough into many small pieces, roll the dough with a rolling pin into round, thin wrappers.
乙：把面团分成一个个小块儿，用擀面杖把它擀成一个圆而薄的饺子皮儿。
Most retailers will roll out changes, such as POS upgrades, in stages. Winners will systematically pilot, A-B test, and share lessons across stores.
大多数零售商会采取变革措施，比如分阶段升级POS机，并在之后的过程中不断进行比较测验，同时在店家之间进行经验分享。
Most retailers will roll out changes, such as POS upgrades, in stages. Winners will systematically pilot, A-B test, and share lessons across stores.
大多数零售商会采取变革措施，比如分阶段升级POS机，并在之后的过程中不断进行比较测验，同时在店家之间进行经验分享。
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